DRIVE GP-SUPPORT & VIBRATORY 1212648 - Caterpillar

The machine must be stopped and the engine at low idle before changing direction. After moving the transmission control, do not accelerate until after hearing or feeling the transmission clutches engage.
Once the operator is familiarized with the transmission features, the operator can match transmission performance to a variety of operational conditions that are normally encountered.Reverse speed, first speed forward and second speed forward are always in torque converter drive. Manually select first speed and reverse speed.The automatic range for third speed through eighth speed is direct drive. For each job condition, the transmission will automatically upshift and the transmission will automatically downshift between second speed and the highest speed that is being used. Move the transmission direction and speed control in one smooth motion. During load cycles, haul cycles and dump cycles, manual shifting is not recommended.
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Use the transmission hold control to prevent unwanted shifts.Upshifting
As the engine is accelerated and the ground speed increases, the transmission will upshift.As the ground speed continues to increase, the transmission will upshift one speed at a time. The transmission will upshift automatically between second speed and the highest speed that has been selected. The transmission will stop upshifting at the transmission speed that has been selected.If the transmission direction and speed control is moved to a higher speed and while the machine is in motion, the transmission will not upshift immediately. The shifting of the transmission is governed by the machine ground speed.Use the transmission hold control in order to prevent unwanted upshifts when the machine is approaching an upgrade.Use the transmission hold control in order to prevent unwanted upshifts when the machine is loading material and dumping material on rough terrain.Downshifting
The transmission is equipped with a downshift inhibitor. The transmission will not necessarily downshift when the transmission control is moved. This protects against engine overspeed.Do not downshift with the transmission hold control applied. The ground speed could decrease suddenly, or the engine could overspeed, when the transmission hold control is released.
If the ground speed is reduced or the engine speed is reduced by an increased load the transmission will automatically downshift in order to select the correct transmission speed.If the transmission direction and speed control is accidentally moved to a lower transmission speed during machine movement, the transmission will not downshift.If the machine continues to slow, or if the machine is brought to a stop, the transmission will automatically downshift one speed at a time. The transmission always returns to second speed. Move the transmission direction and speed control to the NEUTRAL position if the machine is stopped.